The HaskellDB counterpart to the SQL LIKE keyword.
In the expresions, % is a wildcard representing any characters
in the same position relavtive to the given characters and
_ is a wildcard representing one character e.g.

like (constant "ABCDEFFF") (constant "AB%F_F")

is true while

like (constant "ABCDEF") (constant "AC%F")

is false.

Note that SQL92 does not specify whether LIKE is case-sensitive or not.
Different database systems implement this differently.